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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Restricted cash and cash equivalents	$ 128,382,000	$ 104,679,000
Write-off period for no forecasted future cash flows	10 years
Unamortized debt issuance expense	18,400,000	18,100,000
Uninsured cash and cash equivalents	4,600,000	4,100,000
Restricted Cash And Cash Equivalents [Member]
Uninsured cash and cash equivalents	$ 118,900,000	$ 97,500,000
Senior Notes [Member]
Senior notes stated interest rate	9.125%

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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